Great Britain 1951 1s Ochre (Watermark Sideways-inverted) Postage Due, SGD39wi

Great Britain 1951 1s Ochre (Watermark Sideways-inverted), SGD39wi.

Superb unmounted mint with full original gum top marginal example of this rare watermark variety, this being the original discovery and is accompanied by a copy of the letter from Stanley Gibbons confirming its inclusion in the 1994 GB Concise catalogue.

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